The 4D handrails are made of a combination of metal and engineering plastics, and the metal parts are electroplated, which looks more metallic. The engineering plastic part is frosted, and it has a certain texture to the touch.
The 4D armrest can be adjusted in front and rear, left and right, height and horizontal directions. The adjustment in four directions constitutes 4D. The simple point is that this armrest is more flexible and can be adjusted in multiple directions and multiple angles.